Fracture Strength And Marginal Gap of Two Different Types Of Hybrid Ceramic Crowns

Document Type : Original Article

Authors

1 Fixed Prosthodontics Department, Faculty of Dentistry , Suez Canal University ,Ismailia ,Egypt

2 Professor of Crown and Bridge, Faculty of Dentistry, Suez Canal University

3 Lecturer of Crown and Bridge, Faculty of Dentistry, Suez Canal University

Abstract

Purpose: The aim of this study was to evaluate the fracture strength and marginal gap of two different types of hybrid ceramics in comparison to lithium disilicate ceramic crowns using CAD/ CAM system. Methods: Crowns were fabricated from Vita Enamic (a polymer-infiltrated ceramic-network , Vita Suprinity (a zirconia reinforced lithium silicate), and IPS E.max CAD ( lithium disilicate) using the cerec in lab 3D system (n=5) for each group. Measuring of vertical marginal gap before cementation using a metallurgic microscope.The inner surfaces of the crowns were then etched and luted to epoxy resin dies with panavia resin cement. Single load-to-failure tests were performed using a universal testing machine. Statistical analysis were performed using one-way ANOVA and post-hoc Tukey’s HSD test. Results: Vita Suprinity crowns (80.14 ± 7.64) had a statistically significant higher marginal gap than that of E.max (60.13 ±3.63) and Vita Enamic (55.56 ± 7.20).The difference in marginal gap between Vita Enamic and E.max was not stasistically significant. The mean fracture strength values were highest for E.max crowns (1761.6± 101.0 ), slightly lower for Vita suprinity (1633.5 ± 149.5 and both had a significantly higher fracture strength value than Vita Enamic ( 1002.8 ± 78.9).Conclusion: Vita Enamic and E.max had better marginal adaptation than Vita Suprinity crowns. All values of vertical marginal gaps of the used materials were in the range of clinical acceptability. E.max CAD and Vita Suprinity had higher fracture strength values than Vita Enamic crowns.

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